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Algorithm to convert any Image to allRGB by smapling randomly:

1. sort an array of all 16777216 image positions (x,y) randomely
2. loop the positions array and for each position:
3. read the pixel color at the position as a reference
4. sample N random colors from the available colors list
5. for each sample calculate the hypotenuse from the reference color Math.hypot(R - r, G - g, B - b).
6. find the nearst color, use it for that position in the output image
7. update the list of avalible colors (for practicality in chunks)